Add configurable UDP scanning and numeric IP sorting

- Add UDP_SCAN_ENABLED and UDP_PORTS environment variables to control UDP scanning
- UDP scanning disabled by default for faster scans
- Support port ranges (100-200), lists (53,67,68), or mixed formats
- Sort IPs numerically by octets in site management modal

app/web/templates/sites.html

@@ -688,6 +688,18 @@ async function loadSiteIps(siteId) {
         const data = await response.json();
         const ips = data.ips || [];
 
+        // Sort IPs by numeric octets
+        ips.sort((a, b) => {
+            const partsA = a.ip_address.split('.').map(Number);
+            const partsB = b.ip_address.split('.').map(Number);
+            for (let i = 0; i < 4; i++) {
+                if (partsA[i] !== partsB[i]) {
+                    return partsA[i] - partsB[i];
+                }
+            }
+            return 0;
+        });
+
         document.getElementById('ip-count').textContent = data.total || ips.length;
 
         // Render flat IP table